Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02a8c0a392545fe…

MALICIOUS

PDF

79.2 KB Created: 2021-06-07 15:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88322746c63f3cf32e91fc15e98388c9 SHA-1: b89da68422e43f7e0f4f4c0eb78f2c3a89415c29 SHA-256: f02a8c0a392545fec700252b89850099e3a054847f94ff2ff3e3c6ae2d430bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/pbw?utm_term=how+to+tell+parents+your+transgender
    • https://rutepoger.weebly.com/uploads/1/3/4/5/134509459/5020445.pdf
    • https://static.s123-cdn-static.com/uploads/4374984/normal_6001bda884341.pdf
    • https://cdn-cms.f-static.net/uploads/4473379/normal_6026f76b2499b.pdf
    • https://cdn-cms.f-static.net/uploads/4455883/normal_602c868f12fc7.pdf
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fd09e998142e.pdf
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/jefadofiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6061a496b3273.pdf
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5ff59d0f4b082.pdf
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/guporupumipowu-jedugobefo.pdf
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fe199211a733.pdf
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fd819d10ec4d.pdf
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5ff41b5b41ac8.pdf
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/9431b74869.pdf
    • https://static.s123-cdn-static-d.com/uploads/4486548/normal_60b1ec38c1ab6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fajopab.pbworks.com/f/xekida.pdf
    • http://siseraxoru.pbworks.com/w/file/fetch/144484077/82742416405.pdf
    • http://kigemulu.pbworks.com/w/file/fetch/144748068/wowekamum.pdf
    • https://uploads.strikinglycdn.com/files/2ff6c495-bce5-443a-b3f9-e25b20fdaae7/dewalt_dw708_miter_saw_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/ed2d7054-e28d-4f81-80c2-ecbca472c2f8/craftsman_lawn_mower_repair_youtube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cb.bin
5560ee90b0ecefb0bf9cb78901448bd957092a68681f96fb6a503c4b3eba6c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5280 bytes
font_01_sfnt_off0000f3e1.bin
c9b065b5f8601338d30e668bd361eb7fc2ead684d00c9e5be9e8e68d9a86628f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 11072 bytes
font_02_sfnt_off000119ff.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 16060 bytes

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